The ATP World Tour kicks off the U.S. summer swing in Newport, R.I. today at the Hall of Fame Tennis Championships. This year’s field features four of the Top 35 players in the Emirates ATP Rankings, led by No. 17 and 2011-12 champion John Isner. The other seeds are: No. 2 and last year’s runner-up Ivo Karlovic, No. 3/wild card Bernard Tomic, No. 4Jack Sock, No. 5 Adrian Mannarino, No. 6 Sam Querrey, No. 7 Steve Johnson and No. 8 Tim Smyczek. Rising star and Rhode Island native Jared Donaldson will be in action before a hometown crowd, taking on fellow American Austin Krajicek.